Step 1: Marinate the Chicken

1. Prepare Marinade: In a bowl, combine the teriyaki sauce, garlic powder, ginger powder, salt, and pepper.
2. Marinate Chicken: Add the chicken thighs to the marinade, ensuring they are well coated. Let them marinate for at least 15 minutes (or up to 2 hours in the refrigerator for more flavor).

Step 2: Preheat the Air Fryer

1. Preheat Air Fryer: Preheat your air fryer to 375°F (190°C).

Step 3: Cook the Chicken

1. Arrange Chicken: Place the marinated chicken thighs in a single layer in the air fryer basket. Reserve any leftover marinade for later.
2. Air Fry: Cook for 12-15 minutes, flipping halfway through, until the chicken is cooked through (internal temperature of 165°F or 74°C) and slightly caramelized.

Step 4: Prepare the Vegetables

1. Steam Vegetables: While the chicken is cooking, steam the broccoli and bell peppers until tender, about 5-7 minutes. You can also sauté them in a pan with a little olive oil if preferred.

Step 5: Make the Sauce

1. Thicken Marinade: In a small saucepan, bring the reserved marinade to a boil. Reduce heat and let it simmer for about 3-5 minutes until slightly thickened.

Step 6: Assemble the Bowls

1. Slice Chicken: Once the chicken is done, let it rest for a few minutes before slicing it into strips.
2. Build the Bowl: In serving bowls, add a scoop of cooked rice, top with sliced teriyaki chicken, steamed broccoli, and bell peppers. Drizzle the thickened teriyaki sauce over the top.

Step 7: Garnish and Serve

1. Garnish: Sprinkle with sesame seeds and chopped green onions. Serve warm.